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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f22b2171fe79b89727b504d0ea576cb3dd1abd237d31809ff439f2e56b0139c' 
  AND token = 'L/SG8z0rgtB7/jBtDUJSNq9CzyBiD/sb5fD43n60yvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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