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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7787cf027d8345818983c92820994f22e0f0a314243c06961c4646b818388ee' 
  AND token = 'CmHpqBfo+wbnJm5AgNZ/tUQlpo1le048q5JMjsN7mxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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