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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c264a7fbba356e7cd8e83872aa403e391036412eec63ec86a7a9a8761765bd1' 
  AND token = 'f9e+VG3aZN1YxqZVLZbIsGK792OR/110B89kM7FWDqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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