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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15c4060aa333f5cb4d0ebc9368a20a5f2e2ff1d2d6cf2ef46744dc0a1427d081' 
  AND token = 'rW+teGd4+3WBRoGBI56y8a274aKHYHPmkwbPF95WT2g=' 
  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"
    }
  }
}