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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4618e8ee40af06f13678144271bb3b7cc4fc7a0d3a200dfd82f4e9e7caf6352' 
  AND token = 'YCoQW2jYPxC6DXT0lRRv2l3Ty8mofok2p+5o+dn5EcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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