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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a91a635e00da84db7581cc1621037f43d860fe60a1c90e4a34a62be5805c78c5' 
  AND token = 'JTu7yVAej1zVRRTd+R5S1D4c3nqkgo9N2QtN3ZEmXTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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