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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36a0fe55a2ebd6e18a2af8df83e20ec442af4d92dadbdb16b25dac6b73913eb4' 
  AND token = '3k1OxvR1YjUGGLp3ualPh6WmEePzrsFSGanH4Qrr2Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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