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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2245ae88a57425540fda11cb416651af81f6c0891e97c0ef2295dbf2a5ec8e83' 
  AND token = '05B4omRaL5ku9D1a3G4i0/nW8fQiTimkeh/fh+hg0o4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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