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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bba635c9168fb2abe27b2e7549318c019a025ce08e6f776f61bd656a20944fc6' 
  AND token = 'I099DalcBXZ9EXA9jd7v9D+0+6pgoN3YGwt5xs5s64U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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