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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44bd63d9a1c0c1532bc81c1f21d7816e3f240caf1682e10389d46e2c904620b9' 
  AND token = 'QmodD9PkYgAaLNH0BBt6rz1uYPh5BpoK5qnDtxrgSN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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