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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fdae00a1d1f7c5936d57559e6111977acd902586d44d174c510fe6b64eb068f' 
  AND token = 'afE5F2tdaqIOp5esH3R1cYXE9Am4qi/Z7AunankaDNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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