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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '605d153ead5dbdc820ea363cfb9e8549dc32a9a60dedd682fc9bedc8b2da070a' 
  AND token = 'lAZfnqg2zaCuGDRI/BC0M2dvACiVImXObqmRN9VV3Ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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