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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68230a7f3bd703c05b169a939a950ff97aaacec11aeda3fb6d034b117063e2bc' 
  AND token = 'V426O9gDOx3BvCuGUS6APQP9ESAMs0BN73G4v2C2V5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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