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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cea36cd29229778639eed26909f89cedbc0ffbe13307d26f0d19510f4539930' 
  AND token = 'oErcrRcq+70C3PEf2NZaigyp/uBxp3H3jYEMvOI2dpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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