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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b48b80a19c5f641852ff9d15ff33f8c8cd1bc33702d000db950960d64b33891d' 
  AND token = 'E1e7FYwHZ7rJtn2fBl3vwGV4XpAOGfEGMo1v+EPIXI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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