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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c65364d142d5dfebd2262f117f4c754e4b524eb693e779e0b6b80e7f4a619cf' 
  AND token = 'q3r3foY//f9ssEqrNc7sdxsxFMvm5vXc26vIp4C9Nf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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