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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '823115aa07a6847093aa6f4d26caa69c2a0de6daf33f0fb6407580d3ad27f738' 
  AND token = '9YKT7VAfv6pfk7zpleSkkLob3aWKjH59dhR1Ts5Fo1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}