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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3a13c131c0be27587e0706127869bf6ba2625ae7adfc65393083b1c8ec89c30' 
  AND token = 'FHZfZ2cNF5pOFdcT///t71WbzP/v6yEnsrh8+pHOUxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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