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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a93909edfaa9fc3e612dd977639bf46bf8918857c8a91e2f60c862e81f4011c' 
  AND token = 'qPcGlWMj3Ys9zArGQ8duj+MT9pOHBuuJgexGD3kiako=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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