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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebebcc58a855ba491dae1d4a02657b7fb7be5882e47c52c8a006db1c0a8fc678' 
  AND token = 'SIkIAYs0C+nVvPmm1c6IqZNA4dYQSWzW1EYQikOWfrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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