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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c37704b9975702ef739a4e8e4e4dcd90870d2f81c3e45b26f2a2a6932951b090' 
  AND token = 'tOREOrX9jBg3/hnsEqNS6ZilCoiVzqF2IM3x39PJq3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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