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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '905305d8d963e929ac75e3c56533863a324a277bc7880e4d80bbc0e7b22fd19e' 
  AND token = 'J06gxvjKeqgXeDdyKZ4BpJQb/vCgh5eYFwQ1n3xOcNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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