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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85d5a033453b4f9947fbebc36ea943825d6bb4c6ad449f73c15d793f00d6a982' 
  AND token = 'snUHpqfQdCycpmKPLPQ/2MFNU9BPi/WL+Xybj3wMG3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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