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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d6e3e6dc564b72002545c38e19d2e25d27eec96132a331ec0a2e279b58c50fd' 
  AND token = 'hgg12VCEHXgrzsfxE7qwduxAKlAnXx+Q2nMamW9nin4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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