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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b1f8fd868376c0adec88f5ead7626c9594ea033bea4c9d1ed03b8ece0d5aef8' 
  AND token = 'zI+ql+D5oQjDgM6AHLS4wsq5eL7eL7VostMTdbiG3c4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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