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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2fbee29ed6ff6da56693a9994e8e7f856884eca79da660d24cce176830a2e1a' 
  AND token = 'bjnMtiV57ULnMIe0CrXtwFUKBUBc3Pg9y9GYfQegKOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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