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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77c6ea2f59ee66d033b31e4b591b92a991382b0bdb3a63f5118b1a14dbb3994a' 
  AND token = 'F0agc2yXSs+EZYsEaQK/d9eX0la13HRK/CUyr5RFaOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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