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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e27e509fbbd7013876c757b261a2cd703ca5bd17c78ed00cba0b5703fac0e3d' 
  AND token = 'LARg2+4K1kzOcweAcXEBj1wrSiNCZOHUtr4TsrHQHQE=' 
  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"
    }
  }
}