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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a532bcdc9a9566cccc24aa11e14dab12753c11e6c10ce8189d2f4a686f65f0a' 
  AND token = 'LD0jfPV2yISh864ua4D+r3+Q/UzdX5f8LqyHHY2+Fcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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