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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '319567c1a683694e0dfcd9ab7a5d45d684b61563d03779d1aabf353394bbc120' 
  AND token = '7r9rXcOSRqi7Z9a0P+FjMa27IN3gMizBBCUkumfM7VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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