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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '557a5406f1daae5c75a51c71be15d1ada603d95fa331a668d90b327d8f97f825' 
  AND token = 'IHSODAkYC7PNMc2UxTYfaR6OE+U6z9DNBi1DClm8G7o=' 
  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"
    }
  }
}