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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '082e6f40c8ecefefc09bf7434c4524c95998531aeccf3a8d6fee05580410f5c6' 
  AND token = 'NeVv/onU/ETV5Dq4dxHVYY/SrAWoy2Kk8otw4fv7wAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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